How to generate Perlin Noise for materials
You have set the Type to &quot;Hard&quot;, if you set it back to the default &quot;Soft&quot; you will see it's the regular Noise Texture, compare it to this article Wikipedia: Perlin noise.
If you want to achieve a look like &quot;Hard&quot; you have to tweak the distribution with a Color Ramp, here's a simple try on it: